Valve for sterilizing apparatus



June 16, 1925.

G. S. MASCALL.

VALVE Fon STERILIAZING APLARATUS Filed Jan. 5. 1925 2 Sheets-Sheet 1 Inu.uml 16, V1925. 1,541,987

G. S. MASCALL VALVE FOR STERILIZING APPARATUS Filed Jan, 5, 1925 2sheets-snm 2 Patented June 16, 1925.

UNITED STATES Paranaoppl'cp GEORGE SAMUEL ivrAsoALD,` or LONDON,DNerANn'AssreNon JOHNfDDDLa onori DDN LIMITED, `or LONDON, ENGLAND.l e 1e vADvE ron STDRILIZ'ING APPARATUS;

Application led January `5, 1925. Serial N'o. 729.`

4To all whom t may conce/m: i

Beit known that I, GEORGE SAMUEL MAsoALL, "asubject of the King of GreatBritain, residing at Wood Green, London,

5 England, have invented certain new and useful Improvements in Valvesfor Sterilrzing Apparatus, of which the following 1s a specification. v

- The sterilizing apparatus to which the present invention is to beapplied, comprises an inner and an outer casing'forming an inner"chamber for containing the articles A to be sterilized, surrounded byan `outer "chamber `containing steam at pressure and l5 thus forming asteam jacket.

In `utilizing the apparatusit is required that when the articles tobe'sterilized have "been placed inthe inner chamber andthe latterclosed, the air shall be partially exhausted therefrom; then steam isadmitted 'from the outer chamber to the inner charnber," and after asufficient time has elapsed,

the steam is exhausted from the inner chamber, andthen the inner chamberout off from communication with the outer chamber, and

the inner chamber isthen opened and the articles removed therefrom.`When other articleshave been placed in the inner chamber the sameprocedure takes `placeas has i Ibeen abovejoutlined.

control communication between the innerV and outer chambers of theapparatus, and

a cock-to control a passage from the casing of e the' said valve to theatmosphere.

It wasnecessary'with this apparatus to see that the control cock wasopen when the valve was to be placedin position to ex- 40 haust thesterilizing chamber,'while when it was desired to admit steam from thesteam chamber to the sterilizing chamber it was requisite to close thecontrol cock before the rotary valve was placed in position to ei'ectcommunication between the steam chamber and the sterilizing chamber.

Now the object of the present invention is to so construct the rotary`plug valve so that the control cock can be dispensed with and theoperation eected as first set out in the present specification, that islto say in one position of the said valve a partial vacuum will beformed in the inner chamber, in another position will admit steam fromthe outer chamberto the inner chamber, and `in a third Vposition will`entiiy close the valve. e Y

The invention will be described with reference to the accompanyingdrawings, wher'eon Fig. lis a vertical section ofthe valve constructedaccording to this invention, a portion `of the wall of the outer steamchamber and a portion of the wall of the' inner or'sterilizing chamberbeing illustrated. Fig.` 2 `is apart plan view, on `a smaller scale thanFig. 1, showingthe va rious posit-ions of the operating handle of thevalve.' l

Referring more particularly to Fig. V1, the valve is fixed to the outerWall 1 of the outer chamber 2 of a sterilizing apparatus, and at 3 isindicated :thelwall of the inner chamber 4. f' I The `valve com risesl avalve casing`15 fitted with a revo uble plu `6, the stem of which`passes through suita le 'packingand throughV a casing coven'l, `andexterior of the cover `is fitted with a handle 8 more clearly shown atFig.A 2. f Thecasing l5 extends for a distance below the end of the'plugv and is there fitted with an open continuation tube 9. The casingis constructedwith-a tubular shank 10 screwthreaded into the wall l ofthe outer chamber 2';

`An extension tube 11 passes through the tubular Shank 410 and is'screwthreadedv into a boss formed on thecasing 5 through which is abore 12, and the extension tube 11 passes through the outer steamchamber 2 and e`x-v tends `to the inner sterilizing chamber 4, beingsuitably lfixedain the `wall 1 The plug 6 isformed with a central bore13 which at the ibase of the plug terminates in a conical nozzle laopening Opposite the bore Vof the continuation tube `9, andthe upper endo-f the central bore 13y extends at right angles to theperiphery of theplug and in one position of the plug coincides with a bore in the valvecasing 5 opening into the tubular shank 10 of the casing 5, andconsequently, in one position of the plug is in` lommunication with theouter steam cham- The plug 6 is also formed with a second bore 15opening on the base of the plug laterally of the first central bore 13,and the said second bore 15 extends at its other end to the periphery ofthe plug, so that the u per end of the second bore 15 can be broug topposite the bore 12 gf the casing tion Withthe tubular shank l() ofthecasing,

shown in the drawings Diametrically opposite, to the bores l13 and l5,is a U-shaped passage 'I6 formed in .the plug, the arms of thepassageopening onto the periphery of the plug, and in onepositi'onofftheplug these arms-of the U-shaped passage 16Y coincide, one with thebore '12;ofthe casing 5 leadingV totheextension tubeY l1Y and totheinner chamber 4, While, at 'thev sam'e'time the upper arm 'of thepassage lcoincides with thebore into the tubulanshank lOlof'the valvecasing.

In; theposition shown at Fig. 1,.with the;'liandle 8 in the positionshown in full lines at Fig. 2, steam'passesrom the outer chamberfQbythelir'vst central bore 13' and c oni'calvnozzlegzlf-L. to thecontinuatiqn tube 9 and causes, through the extension tube. 11 and.. thesenatoren @fthe plug, 'a par- Vtial")exhausti'on of the" ainfrom the.Ainner Chamber .4L

Wjhenithe inner chamberthas been suffi,- ciently exhausted, the handle 8is'Y then turned through 1 8() degrees from the full line position/shownat'Fig. 2 to the dotted position shown` at`81,V )vlien the` U,-sha`pedpassage `l6f`will be brought Iwith itsl arms respectively coincidingwith thebore leadin-g t'o the tubular shanl'r'lQgand to the,outerchamber 2, 'and' also coinciding With'the bore l`2;lea,ding,to theextension tubev 11 andto thejinner' chamber 4, andconseque'ntfly'; steamwill .freely pass, from"the. outer chamber2 to thefinner chamber 4'.

Whenthe articles in. the inner chamber 4A have beenV sterilized,thefvallve' can then again be, pla'cedinthe, position at Fig'. l andthe' steam exhausted; from' the. inner chamberj4. Then by turningthehandle '8 to thejkpositionsliown inthe gdottedlines at 82, Fig.2,"allithepassages through the plug will betclosedl and thedinner.chamber'can be' Opened and the. sterilized, firtle'sremoved therefromand othersplaced therein A .Vhat claim as my invention andv de# 'sire to,secure byhLetters Patent is;-

Ia Sterilna apparatus Comprising an inner and anl outer casing ,formingan inner sterili'zin chamber and an outer pressure steam chamber; thecombination therewithv eta valve casing', va revolnble `valve pluglocated 'Within'said valvev casing," a cover i' to 'close 'one end ofsaid valve casingta stern onsaid plug extending through said cover, anoperating handle on said stem, the opposite end of said valve casingextending` beyond said valve plug, a continuation tubeopen to the,atmospherel fixed to saidextending `end of said valvecasing, said valvecasing having ,a lateral 4tubular shank ixed to saidouter casingvof theapparatus communicating at one lend With said"'p1essu1e steamV chamberandrat the opposite endfivitll the periphery, 0f said valve plug, anextension tube passing through said tubular shanllctocommunicate at oneend With saidsterilizing cham,H ber4 and at, the'oppositeend with theinte'- rior face of said valve casing, Said `valve plug having acentral-conicalnfozzlefixed at its endopposite to said continuation tubeof said casingl and ,said valveplug having a borecommunicatingWithgsaidnozzle and extending tothe circular aceof vsaidvalve plug to communicate Withjsaid tubular shankY and with said steel@yChamber in one ,positiofufoii said@valve'` plug, and 'said valve plug'having a' secondv borel communicating, in theisame position ofvsaid,valve plug, With said; extension tube anddsaid'sterilizing chamber toexhaustl air oijsteamffrom the latter, andsaid -plug having a U-shapedpassageiadjacent thatsideopposite to the openings ot-sa'id bores thearms of saidy U- shaped passage` opening onto thep'eriphery ofsaidvalve'plug to effect communication in another Aposition ot said valveplug between-*said pressure steamjgchamber through said tubular shankandk simultaneously with' said sterilizing chamber' through `saidextension tube, to admit 'steam from said steam chamber to saidsterilizing chamber.

11i-Witness whereof'. I have hereunto set my hand4 inthe presence oftivo Witnesses.

GEQRGE iSAMUELMASwfL-r o Witnesses:

THoixrAs WILLIAM ROGERS, LESLIE ,FRANK I ROGERS-

